/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.dubbo.common.serialize.java;

import java.io.*;
import java.lang.reflect.Proxy;

public class ClassLoaderObjectInputStream extends ObjectInputStream {

    public ClassLoader getClassLoader() {
        return classLoader;
    }

    public void setClassLoader(ClassLoader classLoader) {
        this.classLoader = classLoader;
    }

    /**
     * The class loader to use.
     */
    private ClassLoader classLoader;

    /**
     * Constructs a new ClassLoaderObjectInputStream.
     *
     * @param classLoader the ClassLoader from which classes should be loaded
     * @param inputStream the InputStream to work on
     * @throws IOException              in case of an I/O error
     * @throws StreamCorruptedException if the stream is corrupted
     */
    public ClassLoaderObjectInputStream(final ClassLoader classLoader,
                                        final InputStream inputStream) throws IOException,
                                                                       StreamCorruptedException {
        super(inputStream);
        this.classLoader = classLoader;
    }

    /**
     * Resolve a class specified by the descriptor using the
     * specified ClassLoader or the super ClassLoader.
     *
     * @param objectStreamClass descriptor of the class
     * @return the Class object described by the ObjectStreamClass
     * @throws IOException            in case of an I/O error
     * @throws ClassNotFoundException if the Class cannot be found
     */
    @Override
    protected Class<?> resolveClass(final ObjectStreamClass objectStreamClass) throws IOException,
                                                                               ClassNotFoundException {

        try {
            return Class.forName(objectStreamClass.getName(), false, classLoader);
        } catch (final ClassNotFoundException cnfe) {
            // delegate to super class loader which can resolve primitives
            return super.resolveClass(objectStreamClass);
        }
    }

    /**
     * Create a proxy class that implements the specified interfaces using
     * the specified ClassLoader or the super ClassLoader.
     *
     * @param interfaces the interfaces to implement
     * @return a proxy class implementing the interfaces
     * @throws IOException            in case of an I/O error
     * @throws ClassNotFoundException if the Class cannot be found
     * @see ObjectInputStream#resolveProxyClass(String[])
     * @since 2.1
     */
    @Override
    protected Class<?> resolveProxyClass(final String[] interfaces) throws IOException,
                                                                    ClassNotFoundException {
        final Class<?>[] interfaceClasses = new Class[interfaces.length];
        for (int i = 0; i < interfaces.length; i++) {
            interfaceClasses[i] = Class.forName(interfaces[i], false, classLoader);
        }
        try {
            return Proxy.getProxyClass(classLoader, interfaceClasses);
        } catch (final IllegalArgumentException e) {
            return super.resolveProxyClass(interfaces);
        }
    }

}